Fastening tool



FIG. 1 is a perspective view thereof;

FIG. 2 is a left side elevational view; wherein the right side is a mirror image thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken-line disclosure in the views represents portions of the article in which the claimed design is embodied, but which form no part of the claimed design. 

CLAIM The ornamental design for a fastening tool, as shown and described. 